CN106714709B - Method of attaching a mesh to a coated ring member of a surgical snare device - Google Patents

Abstract

Provided herein is a method of attaching a mesh to a loop member, the method comprising covering a wire with a layer; manipulating the wire and the layer to form a loop member, wherein the loop member has a shape, placing the mesh on the loop member, wherein portions of the mesh Extending beyond the perimeter of the ring member, transferring heat to the layer to partially melt and become tacky, allowing the mesh to fuse with the adhesive layer and form a strong bond upon cooling, and trim the portion of the mesh that extends beyond the perimeter of the loop fastener. The harvesting device formed by the method includes a ring member and an attached mesh that is positioned within the tubular sheath and is longitudinally movable. Ring members and nets are used to capture the target object and partially retract to remove the object.

Description

Method of attaching a mesh to a coated ring member of a surgical snare device

CROSS-REFERENCE TO RELATED APPLICATIONS

The priority of this application is based on U.S. Patent Provisional Application No. 62/052,538 filed on September 19, 2014 and entitled "Method of Attachinga Mesh to a Coated Loop Member of a Surgical Snare Device" and on May 17, 2015 U.S. Patent Provisional Application No. 62/162,786 for the invention titled "Method of Attaching a Mesh to a Coated Loop Member of a Surgical Snare Device" filed on 19 March.

The above application is incorporated herein by reference in its entirety.

technical field

This application generally relates to surgical instruments. More particularly, the present specification relates to surgical snare devices used to remove objects from body lumens in which a mesh or mesh is fused and incorporated with a coated ring of the surgical snare device member.

Background technique

Existing surgical devices for grasping and removing foreign objects from bodily organs or cavities include mechanically actuated forceps, mechanically actuated snare or mechanically actuated baskets. Each of these surgical devices can be positioned in the body under endoscopy, fluorescence or direct visualization.

The mechanically actuated snare includes an assembly of flexible mesh members mounted on a wire loop enclosed in a sheath. The wire loop can extend beyond the sheath to automatically expand into a shaped opening and, as a result, also open the attached/mounted mesh member into a capture pocket. The size of the opening is controlled by the length of the advancement of the wire beyond the end of the sheath. In use, after positioning the snare adjacent the object, the wire is advanced over the end of the sheath until a loop is formed that is larger than the object. The ring is then positioned until the mesh member and the plane of the ring surround the object. The sheath is then advanced and the wire retracted so that the loop and mesh members enclose and trap/trapp the object.

The mesh member is attached to the wire loop, typically by weaving along the perimeter of the wire loop and/or by using clips or small loops. To close the loop around an object when the loop is withdrawn into the sheath, the strands of material connecting the mesh member to the loop, and in some cases the material comprising the mesh member, can slide along the loop and at the distal end of the loop concentrated. The mesh material may also come together and be interposed between the object and the distal end of the ring. Similarly, the presence of clips or small loops through which the mesh member is bonded to the loop also hinders and makes it more difficult and time consuming to capture objects.

Accordingly, there is a need in the art for an improved method of attaching or connecting a mesh member, mesh or mesh to a ring member of a surgical snare device such that it does not interfere with surgery.

SUMMARY OF THE INVENTION

The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools, and methods, which are exemplary and explanatory and not limiting in scope. This application discloses various embodiments.

The present specification discloses a method of attaching a mesh to a loop member, the method comprising the steps of: manipulating a wire to form a loop member having a shape, wherein the wire is of a first material; applying a layer of adhesive to the loop a member; placing the mesh on the ring member, wherein the mesh is of a second material, wherein the mesh at least partially covers the perimeter of the ring member, and wherein a portion of the mesh extends beyond the a perimeter of a ring member; exposing the adhesive to ultraviolet radiation while the web is held on the ring member; allowing the web to bond with the adhesive; and trimming the extension of the web the portion beyond the perimeter of the ring member, wherein the ring member and attached mesh are collapsible by retracting into the lumen of the sheath and when extended out of the sheath Stretchable to the shape.

The shape of the ring member may be any of oval, circular, teardrop, square, rectangular, quadrilateral or polygonal.

The ring may have a first dimension along a longitudinal axis passing through the center of the ring member and a second dimension along another axis perpendicular to the longitudinal axis and also passing through the center of the ring member. The first dimension may be longer than the second dimension. Optionally, the first dimension ranges from 30 to 70 centimeters and the second dimension ranges from 15 to 40 centimeters. Alternatively, the first dimension is equal to the second dimension. Also alternatively, the first dimension is smaller than the second dimension.

The first material of the wire may be at least one of Nitinol, steel or stainless steel.

The second material of the mesh may be polymeric. Optionally, the second material of the mesh may be at least one of nylon, PET or polyetheramide.

After bonding, the mesh may have pockets at the center of the ring members.

The present specification also discloses an extraction device comprising: a flexible wire loop; a binding material, the binding material being layered on the wire loop; a net, the net being bound to the binding material to establish a an open mesh bounded by the wire loop wherein the outside edge of the mesh is placed on the binding material by heating the binding material to a slightly tacky, partially wet, or tacky state, and allowing the process of cooling the bonding material to which the mesh has been fixedly bonded; and a tubular sheath comprising an elongated body, a proximal end, a distal end, and a tubular sheath therein the lumen, wherein, by manipulating a transfer link located at the proximal end of the tubular sheath, the flexible wire loop with the bound mesh passes through the opening at the distal end of the tubular sheath Rather, it is retractable into the lumen and extendable out of the lumen.

This specification also discloses a method of attaching a mesh to a ring member, the method comprising the steps of: coating a wire of a first material with a layer of a second material; manipulating the wire and the layer to form the ring member, wherein the ring member has a shape and wherein the ring member has a first dimension along a longitudinal axis passing through a center of the ring member and a second dimension along another axis perpendicular to the the longitudinal axis and also passing through the center of the ring member; placing the mesh on the ring member, wherein the mesh is of a third material, wherein the mesh at least partially covers the ring member and wherein portions of the mesh extend beyond the perimeter of the ring member; transferring heat to the layer while retaining the mesh on the ring member partially melts the second material and become tacky, slightly tacky, or partially wet; allowing the web to bond with the partially melted and tacky second material of the layer along the perimeter of the ring member, and upon cooling and trimming the portion of the mesh extending beyond the perimeter of the ring member, wherein the ring member and attached mesh are configured to retract into the sheath by retracting The cavity is collapsible and expandable to the shape when extended out of the sheath.

The shape of the ring member may be any of oval, circular, teardrop, square, rectangular, quadrilateral and polygonal.

Optionally, the first dimension is longer than the second dimension. Also optionally, the first dimension ranges from 30 to 70 centimeters and the second dimension ranges from 15 to 40 centimeters. Alternatively, the first dimension is equal to the second dimension. Also alternatively, the first dimension is smaller than the second dimension.

The first material of the wire may be at least one of Nitinol, steel or stainless steel. Optionally, the second material of the layer is polymeric. Also optionally, the second material of the layer is at least one of the following: nylon, polyetheramide or PET.

Optionally, the third material of the mesh is polymeric. Also optionally, the third material of the mesh may be at least one of nylon or PET.

The layer may be coated on the wire.

Optionally, the layer comprises a hollow tube into which the wire is inserted.

Optionally, the mesh has a shape that approximates the shape of the ring member.

By heating the wire, heat is transferred to the second material of the layer. Use an external power source to electrically heat the wire. Heat is transferred to the second material of the layer by heating the ring member while maintaining the web on the ring member. Optionally, the ring member is heated by exposing the ring member to hot air, wherein the hot air has a temperature in the range of 120 to 180°C or in the range of the melting temperature of the second material.

Optionally, the layer has a thickness ranging from 0.05mm to 0.6mm.

After bonding, the mesh may have pockets at the center of the ring members.

The present specification also discloses a method of attaching a mesh to a ring member, the method comprising the steps of: manipulating a wire to form a shaped wire, wherein the wire is of a first material; covering the forming with a layer of a second material the wire to form the ring member; placing the mesh on the ring member, wherein the mesh is of a third material, wherein the mesh at least partially covers the perimeter of the ring member, and wherein the A portion of the mesh extends beyond the perimeter of the ring member; while the mesh is held on the ring member, heat is transferred to the layer causing the second material to partially melt and become tacky is slightly tacky or partially wet; allows the mesh to bond with a partially melted and tacky second material of the layer; and trims the mesh extending beyond the perimeter of the ring member portion wherein the loop member and attached mesh are collapsible by retracting into the lumen of the sheath and expandable to the shape when extended out of the sheath.

The shape of the wire may be any of an oval, a circle, a teardrop, a square, a rectangle, a quadrilateral or a polygon.

The ring may have a first dimension along a longitudinal axis passing through the center of the ring member and a second dimension along another axis perpendicular to the longitudinal axis and also passing through the center of the ring member. The first dimension may be longer than the second dimension. Optionally, the first dimension ranges from 30 to 70 centimeters and the second dimension ranges from 15 to 40 centimeters. Alternatively, the first dimension is equal to the second dimension. Also alternatively, the first dimension is smaller than the second dimension.

The first material of the wire may be at least one of Nitinol, steel or stainless steel.

The second material of the layer may be polymeric. Optionally, the second material of the layer may be at least one of nylon, PET or polyetheramide.

The third material of the mesh may be polymeric. Optionally, the third material of the mesh may be at least one of nylon or PET.

The layer may be coated on the shaped wire.

Optionally, the layer is a hollow tube into which the shaped wire is inserted.

By heating the shaped wire, heat is transferred to the second material of the layer. Optionally, the shaped wire is electrically heated using an external power source.

Heat is transferred to the second material of the layer by heating the ring member while maintaining the web on the ring member. Optionally, the ring member is heated by exposing the ring member to a stream of hot air, wherein the hot air has a temperature in the range of 120 to 180°C or in the range of the melting temperature of the second material .

Optionally, the layer has a thickness ranging from 0.05mm to 0.6mm.

After bonding, the mesh may have pockets at the center of the ring members.

This specification also discloses a method of attaching a mesh to a ring member, the method comprising the steps of: covering a wire of a first material with a layer of a second material; manipulating the wire and the layer to form the ring member , wherein the ring member has a shape and wherein the ring member has a first dimension along a longitudinal axis passing through the center of the ring member and a second dimension along another axis perpendicular to the the longitudinal axis and also passing through the center of the ring member; placing the ring member on the base fixture to be at least partially retained by a plurality of magnets embedded within the base fixture; wherein the retaining ring member defines a hollow portion formed in the base fastener, the hollow portion being configured to receive a pocket fastener; placing the mesh on the ring member, wherein the mesh is of a third material, wherein the mesh is at least partially covering the perimeter of the ring member and the hollow portion, and wherein portions of the mesh extend beyond the perimeter of the ring member; placing the pocket fastener on the mesh, whereby the mesh Extruding into the hollow portion; transferring heat to the layer while retaining the web on the ring member so that the second material partially melts and becomes tacky, slightly tacky or partially wet; allowing the mesh to fuse with the partially melted second material of the layer along the perimeter of the ring member and to form a strong bond upon cooling; and trimming the extent of the mesh the portion beyond the perimeter of the ring member, wherein the ring member and attached mesh are collapsible by retracting into the lumen of the sheath and when extended out of the sheath Stretchable to the shape.

The shape of the ring member may be any of oval, circular, teardrop, square, rectangular, quadrilateral and polygonal.

The first dimension may be longer than the second dimension. Optionally, the first dimension ranges from 30 to 70 centimeters and the second dimension ranges from 15 to 40 centimeters. Alternatively, the first dimension is equal to the second dimension. Also alternatively, the first dimension is smaller than the second dimension.

The first material of the wire may be Nitinol, steel or stainless steel.

The second material of the layer may be polymeric. Optionally, the second material of the layer is nylon, polyetheramide or PET.

The third material of the mesh may be polymeric. Optionally, the third material of the mesh is nylon or PET.

The layer may be coated on the wire.

Optionally, the layer is a hollow tube into which the wire is inserted.

The mesh may have a shape that approximates the shape of the ring member.

By heating the wire, heat is transferred to the second material of the layer. Optionally, the wire is electrically heated using an external power source.

Optionally, heat is transferred to the second material of the layer by heating the ring member while maintaining the mesh on the ring member. Optionally, the ring member is heated by exposing the ring member to a stream of hot air, wherein the hot air has a temperature in the range of 120 to 180°C or in the range of the melting temperature of the second material .

Optionally, the layer has a thickness ranging from 0.05mm to 0.6mm.

After bonding, the mesh may have pockets at the center of the ring members.

The present specification also discloses a method of attaching a mesh to a ring member, the method comprising the steps of: manipulating a wire to form a shaped wire, wherein the wire is of a first material; covering the forming with a layer of a second material to form the ring member; placing the ring member on the base fixture to be at least partially retained by a plurality of magnets embedded in the base fixture, wherein the retaining ring member is wherein a hollow portion formed in the base fastener is enclosed, the hollow portion is configured to receive a pocket fastener; the mesh is placed on the ring member, wherein the mesh is of a third material, wherein the the mesh at least partially covers the perimeter of the ring member and the hollow portion, and wherein a portion of the mesh extends beyond the perimeter of the ring member; placing the pocket fastener on the mesh to secure the mesh The mesh is extruded into the hollow; while the mesh is held on the ring member, heat is transferred to the layer, causing the second material to partially melt and become tacky, slightly tacky or partially wet; allowing the mesh to bond with a partially melted second material of the layer; and trimming the portion of the mesh extending beyond the perimeter of the ring member, wherein the ring The member and attached mesh are collapsible by retracting into the lumen of the sheath and expandable to the shape when extended out of the sheath.

The foregoing and other embodiments of the present specification will be described in greater detail in the accompanying drawings and the detailed description provided below.

Description of drawings

These and other features and advantages of the present invention will be further understood because these and other features and advantages of the present invention will be better understood by reference to the following detailed description when analyzed in conjunction with the accompanying drawings.

1A is a bottom perspective view of a snare ring according to an embodiment of the present specification;

Figure IB is a side perspective view of the snare ring of Figure 1A;

2 is a perspective view of a target object capture and extraction snare device, also showing an enlarged portion, according to an embodiment;

3 is a cross-sectional view of a tubular member or sheath within which the snare ring of FIG. 1A is stored and in a fully retracted or retracted position;

4 is a schematic cross-sectional view of a coated ring member of a snare ring according to an embodiment of the present specification;

5A illustrates a coated ring member of a snare ring according to some embodiments of the present specification;

5B illustrates a snare cuff-coated ring member according to another embodiment of the present specification;

6 is a top perspective view showing the snare ring in a teardrop configuration with the mesh removed, according to an embodiment of the present specification;

7A presents a plan view of a ring member including a fastener, tie or buckle, such as at least one weld, at a proximal end of the ring, according to an embodiment;

7B shows a fastener, such as a weld, that is rough cut and thus has a corrugated or jagged cut surface;

Figure 7C shows a fastener, such as a weld, which is cut such that it obtains a smooth cut surface;

8 is a perspective view of an embodiment of a fastener used to attach, bond or connect a mesh to a coated ring member;

Figure 9 illustrates a thermal bonding mechanism in which a mesh is bonded to a coated ring member;

10 illustrates the use of a laser beam to cut an extension of a mesh bonded to a coated ring member according to an embodiment;

Figure 11 is a perspective view of a mesh cutting die used to cut extensions of mesh bonded to a coated ring member;

12 illustrates a portion of the mesh joined along the proximal length of the coated ring member forming a shrink tube that reinforces the proximal end of the coated ring member;

13 is a flow chart illustrating exemplary steps for attaching a mesh/mesh to a coated ring member according to an embodiment of the present specification.

Detailed ways

A surgical snare or extraction device for extracting objects from a human body is disclosed. The snare device is intended for endoscopic use and can be used to remove relatively heavy objects within a relatively tight lumen, such as, for example, a compact bolus from the esophagus. In the devices discussed, the terms distal and proximal are used relative to the operator's hand. In other words, when the device is used within the working/service channel of an endoscope or similar device, the proximal and distal orientations are relative to the surgeon or operator of the device, where the proximal position represents the device's proximity to the surgeon or to the device. The operator's part, and the distal position represents the distal end of the device that points toward the patient.

This specification refers to various embodiments. The following disclosure is provided to enable those of ordinary skill in the art to practice the present invention. The language used in this specification should not be construed as a general negation of any particular embodiment or used to limit the claims beyond the meaning of the terms used herein. The general principles defined herein may be applied to other embodiments and applications without departing from the scope and spirit of the invention. Also, the terminology and syntax used are for the purpose of describing example embodiments and should not be regarded as limiting. Thus, the present invention is to be accorded the broadest scope encompassing many alternatives, modifications and equivalents consistent with the principles and features disclosed. For the purpose of clarity, details related to technical material that is known in the technical fields of the invention are not described in detail so as not to unnecessarily obscure the present invention.

In the specification and claims of this application, each of the words "comprising", "comprising" and "having" and their forms are not necessarily limited to the means in the list associated with that word.

As used herein, the indefinite article means "at least one" or "one or more" unless the context clearly dictates otherwise.

It should be noted that, according to some embodiments, the term "endoscope" referred to herein may refer in particular to colonoscopes or gastroscopes, but is not limited to colonoscopes and gastroscopes only. The term "endoscope" may refer to any instrument used to examine the interior of a hollow organ or cavity of the body.

FIGS. 1A and 1B are a bottom perspective view and a side perspective view, respectively, of the snare ring 101 , while FIGS. 2 and 3 are a perspective view and a longitudinal direction, respectively, of a target object capture and extraction snare device 100 according to an embodiment of the present specification. Sectional view. Referring now to Figures 1A, 1B, 2 and 3, a snare ring 101 includes a flexible, extensible, coated ring member 105 (hereinafter also referred to interchangeably as a "ring"), a mesh or mesh 110 being The ring member 105 is detachably, removably but securely attached or connected. The ring member 105 is described as "coated" because the wires of the ring 105 are coated or wrapped with a bonding material, as discussed below with reference to FIG. 3 . The snare device 100 further includes a tubular member or sheath 115 having an elongated body having a proximal end 115a and a distal end 115b and a channel or lumen 120 when in fully retracted or retracted In position, the lumen 120 is used to recoverably store the coated ring member 105 having the coated mesh or mesh 110 therein, as depicted in FIG. 3 .

和

根据实施例，网或网状物或网体110的聚合材料具有弹性性能，使得聚合材料可以在机器方向(MD)上被前进、拉伸或伸长最少10％至40％，并且在机器交叉方向(CMD)上被前进、拉伸或伸长最少20％至70％。本领域的普通技术人员应理解的是，这里所用的术语“机器方向”(MD)指材料通过工艺流动的方向，而这里使用是术语“机器交叉方向”(CMD)指与机器方向大体垂直的方向。在各种实施例中，网110具有范围在每平方厘米15个孔和每平方厘米40个孔之间的孔隙率。在一些实施例中，形成网或网状物110的聚合材料的厚度范围在0.05mm和0.3mm之间。可替换地，网110可以是聚合材料的连续膜或网体。此外，在各种实施例中，网、网状物或网体110是带织纹的或不带织纹的。根据实施例，当将网110与带涂层的环构件105结合时，网、网状物或网体110包括袋或垂体145。In one embodiment, the mesh or mesh 110 is formed by a process such as, but not limited to, wrapping a woven multi-strand polymeric material such as nylon or PET (polyethylene terephthalate) (or later in the other polymers described in the specification), while the tubular member or jacket 115 is fabricated from an insulating flexible material including high density polyethylene (HDPE), tetrafluoroethylene (TFE) resin or polytetrafluoroethylene (PTFE) polymers such as

and

According to an embodiment, the polymeric material of the web or web or body 110 has elastic properties such that the polymeric material can be advanced, stretched or elongated by a minimum of 10% to 40% in the machine direction (MD) and cross machine direction (MD) The direction (CMD) is advanced, stretched or elongated by a minimum of 20% to 70%. It will be understood by those of ordinary skill in the art that the term "machine direction" (MD) as used herein refers to the direction in which material flows through the process, whereas the term "cross-machine direction" (CMD) as used herein refers to a direction generally perpendicular to the machine direction direction. In various embodiments, the mesh 110 has a porosity ranging between 15 holes per square centimeter and 40 holes per square centimeter. In some embodiments, the thickness of the polymeric material forming the mesh or mesh 110 ranges between 0.05 mm and 0.3 mm. Alternatively, mesh 110 may be a continuous film or mesh of polymeric material. Furthermore, in various embodiments, the mesh, mesh or mesh body 110 is textured or non-textured. According to an embodiment, the mesh, mesh or mesh body 110 includes a pocket or pituitary 145 when the mesh 110 is combined with the coated ring member 105 .

The sheath 115 has a distal opening 122 in communication with its lumen 120 through which the coated ring member 105 can be partially or fully extended for deployment and partially or fully retracted to store. In one embodiment, extension and retraction of the coated ring member 105 from within the sheath lumen 120 is accomplished using a motion transfer link 170 that connects to the sheath 115 through the proximal opening 124 The proximal end 107 of the coated ring member 105. In various embodiments, the motion transfer link 170 is a hollow tube, twisted wire, or braided wire of a suitable rigid material such as stainless steel. When the operator pulls the rod 170 out of the proximal opening 124, the coated ring member 105 is retracted into the sheath 115, and when the operator pushes the rod 170 into the proximal opening 124, the coated ring member 105 is retracted into the sheath 115. The ring member 105 of the layer extends beyond the distal opening 122 of the sheath 115 .

As shown in FIG. 2 , the sheath 115 extends distally from the distal end 196a of the handle assembly 196 . In one embodiment, the length of the sheath 115 proximate the distal end 196a of the handle assembly 196 includes an axial strain relief 197 . Axial strain relief 197 covers sheath 115 and provides strain to transfer link 170 (shown in FIG. 3 ) when transfer link 170 is advanced into sheath 115 to deploy the snare ring freed. Axial strain relief 197 ensures smooth movement of transfer link 170 to facilitate proper deployment of the snare ring.

4 is a schematic cross-sectional view of a target object capture and extraction device coated ring member 105 made in accordance with aspects of the present specification. Referring now to Figures 1A, 1B, 2, 3 and 4, at the center of the coated ring member 105 is a wire 130 of diameter "d" constructed of a resilient but durable and electrically conductive material that can be formed for the desired ring shape. According to an embodiment, the diameter "d" of the wire 130 ranges from 0.2 to 0.6 centimeters. When the coated ring member 105 is extended (FIGS. 1A, 1B and 2) within the tubular member or sheath 115 from its retracted or retracted position (FIG. 3), it automatically expands to maintain its desired annular configuration , thereby providing openings for the attached mesh or mesh 110 . Similarly, when retracted into the tubular member or sheath 115 , the coated ring member 105 retracts along the attached mesh or mesh 110 and is compressed within the sheath lumen 120 . In various embodiments, wire 130 is made of braided steel, a metal shape memory alloy such as Nitinol, or any other suitable material that is flexible, a conductor of heat and electricity, and at the same time has sufficient elasticity to maintain when deployed It expects a ring shape.

In one embodiment, the desired deployed shape of the wire 130, and thus of the coated ring member 105, is a teardrop shape (as shown in the coated coated with its mesh or mesh removed) 6 of the ring member 105), while in alternative embodiments the desired expanded shape is an oval (FIGS. 1A, 1B), a circle, a square, a rectangle, a quadrilateral, a polygon, or any other suitable shape, which is It is obvious to those of ordinary skill in the art. Referring to FIG. 1 , in one embodiment described with respect to an oval or teardrop shape, the ring has a first dimension L1 along _a longitudinal axis 150 passing through the reference center of the ring and along another axis 165 generally perpendicular to the longitudinal axis 150 And through the second dimension L ₂ of the reference center 155 of the ring. In various embodiments, the first dimension L ₁ is greater than the second dimension L ₂ . In some embodiments, the first dimension L ₁ is equal to the second dimension L ₂ . In other embodiments, the first dimension L ₁ is smaller than the second dimension L ₂ . According to various embodiments, when the desired shape of the line 130 is a teardrop or an ellipse, the _first dimension L1 ranges from 30 to 70 centimeters, and the _second dimension L2 ranges from 15 to 40 centimeters.

的共聚物共混物、苯乙烯-丁二烯共聚物、聚氨酯-丁二烯共聚物、聚己内酯或低聚己内酯共聚物、聚乳酸(PLLA)或聚丙交酯(PL/DLA)共聚物，PLLA-聚乙醇酸(PGA)共聚物和光交联聚合物。Referring back to FIG. 4, in accordance with aspects of the specification, the wire 130 is coated or wrapped by a layer 135 having a thickness "t" and consisting of a polymeric material that, in one embodiment, acts as a "self-bonding adhesive"" effect. As used herein, the term "self-bonding adhesive" is defined to refer to a material that, when heat or solvent is applied, can be altered (or partially melted) to become sufficiently adhesive or Viscous so that when cooled it will form a firm bond with another polymeric material and/or metal. The "self-bonding adhesive" bonds the web to the ring in the area of contact between the web and the ring, and provides a secure connection when the adhesive has cooled. For the purposes of this specification, tacky is defined as having a slightly tacky quality or being partially moist or not completely dry. When heated below their decomposition or ignition temperature, polymeric materials become thermoplastics with sufficient adhesive or cohesive properties to bond to similar or dissimilar surfaces, such as metals. Examples of polymeric materials include polyolefins, PET (polyethylene terephthalate), polyurethanes, polynorbornenes, polyethers, polyacrylates, polyamides (polyether block amides, also known as polyetheramides), Polysiloxane, polyetheramide, polyetherester, trans-polyisoprene, polymethyl methacrylate (PMMA), cross-linked trans-polyoctene, cross-linked polyethylene, inorganic-organic hybrid polymerization material, with polyethylene and

blends of copolymers, styrene-butadiene copolymers, polyurethane-butadiene copolymers, polycaprolactone or oligocaprolactone copolymers, polylactic acid (PLLA) or polylactide (PL/DLA) ) copolymer, PLLA-polyglycolic acid (PGA) copolymer and photocrosslinked polymer.

In one embodiment, the polymeric material of layer 135 is nylon or polyetheramide. In one embodiment, layer 135 is formed by coating wire 130 with a polymeric material such as polyetheramide using conventional methods such as extrusion, overmolding, or dipping. In another embodiment, layer 135 is a hollow tube of polymeric material such as polyetheramide into which wire 130 is inserted such that the tube wraps or covers wire 130 like a sheath. In some embodiments, the layer 135 in the form of a hollow tube has an inner diameter ranging between 0.3 mm and 1.0 mm and an outer diameter ranging between 0.5 mm and 1.50 mm. In various embodiments, the layer 135 in the form of a coating of polymeric material such as polyetheramide or a hollow tube has a thickness "t" ranging from 0.05 mm to 0.6 mm.

FIG. 5A shows an embodiment of a snare ring 101a with a middle layer 135 (in the form of a coating or hollow tube) continuously wrapping or covering the wire 130 . In an alternative embodiment, as shown in snare ring 101b in FIG. 5B, layer 135 is segmented into segments such that portions 130' of wire 130 remain bare or uncoated or hollow ( layer 135). The discontinuous or segmented layer 135 provides the mesh 110 more flexibility to deform when the snare ring 101 is being extended or retracted. According to one aspect, layer 135 (in the form of a coating or hollow tube) has a bright color such as, but not limited to, blue, green, red, and the like. The bright color of layer 135 enables enhanced visibility of the ring boundary when ring 101 is in fluid connection with bodily fluids, such as during endoscopic procedures.

During the manufacturing or assembly process of the snare ring 101 of the present specification, in one embodiment, the wire 130 is first bent or bent into the desired ring shape and thereafter coated or wrapped with the layer 135 . In an alternative embodiment, however, the wire 130 is first coated or wrapped with the layer 135 and thereafter bent or bent into the desired loop shape. In some embodiments, wire 130, which has been bent or bent into the desired loop shape, includes fasteners, binders, or buckles 140 at the proximal end of loop 105, as shown in Figure 7A. In various embodiments, the fastener, tie or buckle 140 includes at least one weld, hypotube, at least one clip or other fastener to hold the proximal arms 141 , 142 together by holding the wire 130 together The proximal arms 141 , 142 are obtained by bending into a loop 150 . However, in embodiments where the wire 130 needs to be encased within the hollow tube 135, the fasteners, bindings or clasps 140 interfere. Thus, in one embodiment, the fastener 140, such as at least one weld, is cut without damaging the wire 130, while still maintaining a smooth area or surface at the cut. Incorrectly or roughly cut fasteners or bindings, such as welds, have a corrugated or jagged surface 143, as shown in Figure 7B, while correctly cut fasteners or bindings, such as welds , a smooth surface 143' is obtained, as shown in FIG. 7C. In various embodiments, the internal channels of wire 130 and/or hollow tube 135 may be coated with a dry lubricant to reduce friction during placement of wire 130 into hollow tube 135 . Non-limiting examples of dry lubricants include PTFE (polytetrafluoroethylene) powder, mold release (McLube), silicone oil, and the like. However, in some embodiments, the wire 130 is bent or bent into the desired loop shape without a weld. In such an embodiment, placing the wire 130 into the hollow tube 135 is easily accomplished.

1A, 1B, 2-4, 5A, and 5B, and FIGS. 7A, 7B, 7C, and 8-12, in accordance with embodiments of the present specification, for attaching a net or mesh 110 to a coated Ring member 105, mesh or mesh 110 is placed or held on coated ring member 105, and wire 130 is heated. The shape of the mesh 110 approximates the shape of the coated ring member 105 . Additionally, the dimensions of the mesh 110 are selected such that portions of the mesh 110 extend along the edges of the mesh 110 beyond the perimeter of the underlying coated ring member 105 . In one embodiment, the mesh 110 has deliberate slack when placed on the coated ring member 105 . The relaxation preferably causes deformation of the bag 145 at the centerline 155 of the coated ring member 105 after the mesh 110 is attached or connected to the coated ring member 105 .

FIG. 8 shows an embodiment of a base fastener 175 that is used to attach the mesh 110 to the coated ring member 105 . At the upper surface 177 , the base fixture 175 includes a ring retention area 176 that approximates the shape of the coated ring member 105 . In one embodiment, the ring retention area 176 includes a plurality of magnets 178 that firmly hold the coated ring member 105 in place once the coated ring member 105 is placed on the ring retention area. bit. The ring retention area 176 defines a hollow portion in the meantime and forms a base fixture 175 therein. The hollow portion is configured to receive the pocket fastener 180 therein.

For assembly, the coated ring member 105 is placed over the ring retention area 176 so that the coated ring member 105 is held securely by the plurality of magnets 178 . In one embodiment, a plurality of magnets 178 are embedded within the base fastener 175 to be approximately along the perimeter or boundary defined by the ring retention area 176 . Next, the mesh 110 is placed on the retained coated ring member 105 . At this point, the mesh 110 covers the coated ring member 105 such that portions of the mesh 110 along its edges extend beyond the perimeter of the coated ring member 105 below. A pocket fastener 180 is then placed on the portion of the mesh 110 above the hollow portion, thereby urging, squeezing or pressing the mesh 110 into the hollow portion. This squeezing of the mesh 110 to fill the hollows results in deformation of the bag 145 (as shown in Figure IB). According to one aspect, the mesh 110 is held in place by at least the weight of the pocket fastener 180 . The plurality of guide pin holes 182 allow corresponding guide pins to be inserted therein to maintain and/or maintain the alignment of the mesh 110, loop 105 and pocket fastener 180 together.

To connect the mesh 110 to the coated ring member 105, the wire 130 is heated to a temperature that partially melts, softens, and becomes tacky or tacky enough not to burn the layer 135 of polymeric material such as nylon or polyetheramide or decomposition. The appropriate temperature depends at least on the particular polymeric material being used. In one embodiment, heat is transferred to layer 135 by electrically heating wire 130 using an external circuit or power source. In an alternative embodiment, heat is transferred to the layer 135 by subjecting the coated ring member 105 to the impact of hot air while the upper web 110 is held securely thereon. In various embodiments, the hot air has a temperature in the range of 120 to 180°C or in the range of the melting temperature of the bonding material. In yet another embodiment, as shown in FIG. 9, a hot extrusion 185 (or any other heat source apparent to those of ordinary skill in the art) along the surface of the coated loop member 105 of the mesh 110 is performed by using a high temperature ironing The edges above the perimeter are hot ironed, hot pressed or hot welded to the web 110 and heat is transferred to the layer 135 . As a result, the plurality of polymeric strands (such as, for example, nylon or PET strands) of the plurality of webs 110 are bonded to the loops by the adhesive or adhesive layer 135, thereby forming a strong bond upon cooling.

When the mesh 110 is securely bonded to the layer 135 (and thus to the coated loop member 105 ), as shown in FIG. 10 , a portion 186 of the mesh 110 that extends beyond the perimeter of the coated loop member 105 is cut or Trimmed to remove loose end or portion 186 (also referred to as "extension"). In one embodiment, as shown in FIG. 10 , a laser beam 187 is used to cut or trim the extension 186 . In an alternate embodiment, as shown in Figure 11, a web cutting die 190 is used. As shown, an attached, bonded or fused mesh 110 and coated ring member 105 assembly (hereinafter also referred to as "bonded assembly") is placed and aligned between guide or alignment pins 192 and 194 . The cutting die 190 approximates the shape of the ring member 105 and has a hollow portion 195 that surrounds the pocket 145 formed when the die 195 is pressed over the "bonding assembly". Pressing or pushing the die 190 on the "bonding assembly" results in the cutting or trimming of the extension 186 . When the cutting die 190 is pressed over the "bonding assembly" to achieve proper alignment of the die 190 with respect to the "bonding assembly", the mating holes 192' In yet further embodiments, ultrasonic welding is used to cut or trim the extension 186 . Heat is generated via ultrasonic welding, thereby melting areas of the web and cutting them.

As shown in FIG. 12 , according to an embodiment, the portion of the mesh 110 extending over the proximal length 198 of the loop 105 is melted or bonded to the corresponding portion of the layer 135 along the proximal length 198 . After cutting or trimming the extension 186 (as shown in FIGS. 10 and 11 ), the proximal length 198 holds the melted portion of the mesh 110 forming a shrink tube thereon, thereby holding together and the proximal arms 141 , 142 ( Visible in Figure 7A) provides sufficient enhancement.

According to an alternative embodiment of the present specification, mesh 110 is bonded directly to wire 130, obviating the need for layer 135. In such embodiments, web 110 is bonded to wire 130 using the following methods: adhesive, which is then dried; UV, laser, or thermal fusion; thermal fusion; or, any method known to those of ordinary skill in the art other methods. In one embodiment, the web 110 is directly bonded to the wires 130 (layer 135 is not required) using a UV (ultraviolet) curing adhesive during the curing process, where high intensity UV light or radiation is used to accelerate the curing of the adhesive or drying (by exposing or irradiating the binder by UV radiation). An example of a UV curable adhesive is sold by Henkel brand adhesive.

In use, the tubular member or sheath 115 in which the flexible or extensible coated ring member 105 is compressed is inserted through the working or service channel of an endoscope to be positioned proximate a target object within a body cavity, Such as polyps, severed human tissue, foreign objects, or compressed boluses. When the capture of the target object is to be performed, the coated ring member 105 is extended from the tubular member or sheath 105 and, in the process, automatically stretches, thereby providing the attached mesh 110 and thus the bag 145 Open your mouth. In one embodiment, the coated ring member 105 is partially retracted to secure the target object within the net 110 when the target object is captured in the net 110 . In another embodiment, once the target object is captured in the mesh 110 , the harvesting device and target object are removed from the patient without retracting the coated ring member 105 into the sheath 115 . In one embodiment, the presence of the pocket 145 further helps to hold the target object securely.

13 is a flow chart illustrating exemplary steps of a method of forming a coated loop member and attaching, bonding or connecting a mesh or mesh to the coated loop member according to various embodiments of the present specification . At step 1310, lines are obtained. The wire has a diameter "d" and is braided steel, stainless steel, Nitinol, or any other shape memory alloy known to those of ordinary skill in the art. In one embodiment, at arrangement 1315a, the wire is coated with or wrapped in a layer of polymeric material having a thickness "t", such as, but not limited to, nylon or polyetheramide. The layer is formed by coating the wire with a polymeric material or inserting the wire in a hollow tube of polymeric material. At step 1320a, the wire coated or wrapped with a layer of polymeric material is then manipulated, such as bent or bent into a loop of a desired shape and size, to form a coated loop member. In another embodiment, at step 1315b, the wire is first manipulated such as being bent or bent into a loop of the desired shape and size. Thereafter, at step 1320, the loop-forming wire is coated with or wrapped in a layer of polymeric material to form a coated loop member.

In some embodiments, at step 1315b, the wire, which is first bent or bent into the desired loop shape, includes fasteners, binders or buckles at the proximal end of the loop to convert the proximal end obtained by bending the wire Arms stay together. In various embodiments, the fastener, tie, or buckle includes at least one weld, hypotube, at least one clip, or any other fastener apparent to one of ordinary skill in the art. In such an embodiment, before coating or wrapping the wire with a layer of polymeric material (such as a hollow tube in one embodiment) to form the coated loop member, the fastener, such as at least one weld, is first be cut or removed.

In various embodiments, the desired shape of the ring is an oval, circle, teardrop, square, rectangle, quadrilateral, or polygon. In one embodiment, the ring has a first dimension along a longitudinal axis passing through the center of the coated ring member and a second dimension along another axis perpendicular to the longitudinal axis and also passing through the belt The center of the coated ring member. In various embodiments, the first dimension is longer than the second dimension. In some embodiments, the first dimension is equal to the second dimension. In other embodiments, the first dimension is smaller than the second dimension. It will be appreciated that the coated ring member is formed using steps 1315a and 1320a or alternatively using steps 1315b and 1320b.

Next, at step 1325, a mesh, mesh or mesh of polymeric material such as but not limited to nylon, PET is obtained. The shape of the mesh approximated the shape of the coated ring members, and the dimensions of the mesh were slightly larger than the dimensions of the coated ring members. At step 1330, the coated ring member is placed on a base fixture having a plurality of magnets to hold the coated ring member in place. Thereafter, the mesh or mesh is placed and held on the coated ring member such that portions of the mesh along its edges extend beyond the perimeter of the coated ring member. In some embodiments, the mesh partially covers the perimeter of the ring member. In other embodiments, the mesh completely covers the perimeter of the ring member. In one embodiment, a pocket is used to form the fastener, and a portion of the mesh covering the center of the coated ring member is squeezed or pressed to be located within a hollow defined in the base fastener (thereby passing through at least the pocket fastener the weight to keep the net in place). This allows for deliberate slack in the mesh while it is being placed on the coated ring member. After the mesh is attached to the coated ring member, the relaxation results in deformation of the bag at the center of the coated ring member.

Now, at step 1335, heat is transferred to the layer of polymeric material. In one embodiment, the wire of the coated ring member is heated by the bag to a suitable temperature so that the layer of polymeric material partially melts, softens and becomes sufficiently tacky, slightly tacky or partially wet without burning or decomposing. Heat is transferred to the layer of polymeric material using methods such as, but not limited to, using an external circuit or power source to electrically heat the underlying wire, exposing the coated ring member to a stream of hot air (while the stream of hot air blows over the mesh and When the coated loop is placed on the loop, the net is firmly held in place), applying a high temperature ironing, hot pressing, or Any other method apparent to one of ordinary skill in the art. As a result, at step 1340, the plurality of strands of the web located on the surface of the perimeter of the coated ring member are fused or bonded to the adhesive or tacky layer and are coated with the tape as it cools. The ring members of the layers are firmly bonded. Finally, at step 1345, the portion of the bonded mesh extending beyond the perimeter of the coated ring member is cut or trimmed using a laser beam, ultrasonic welding, or mesh cutting die. This ensures that there are no loose ends or strands extending beyond the coated ring member, as this could allow the mesh to tear and/or damage the surrounding tissue when used in endoscopic procedures.

The above examples are merely illustrative of the many applications of the methods and systems of this specification. Although only a few embodiments of the present invention have been described herein, it should be understood that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. Accordingly, the examples and embodiments provided are to be regarded as illustrative and not restrictive, and the invention may be modified within the scope of the appended claims.

Claims (20)

1. An extraction device, comprising: A snare ring, which includes: central opening; a ring member open around the center, and a layer of material covering the ring member; a mesh extending across the central opening of the snare ring, wherein the mesh comprises: multiple holes, and multiple strands; wherein a first portion of the plurality of strands surrounds the plurality of holes, wherein a second portion of the plurality of strands joins the material layer, the second portion of the plurality of strands is positioned along an outer perimeter of the mesh, and wherein the second portion of the plurality of strands is firmly bonded or fused to the material layer, A sheath, which includes: lumen, proximal end, the distal end, and a distal opening, wherein the lumen extends between the proximal end and the distal end, and wherein the lumen communicates with the distal opening; a drive strand extending through the lumen of the sheath to a portion of the snare ring proximate the central opening, wherein movement of the drive strand within the lumen of the sheath Configured to: moving at least a portion of the snare ring and at least a portion of the mesh distally out of the distal opening of the sheath, and moving at least a portion of the snare ring and at least a portion of the mesh proximally into the distal opening of the sheath, wherein the second portion of the plurality of strands is the snare ring and the mesh remain firmly bonded to the material layer as they move through the distal opening of the sheath; and A shrink tube on the portion of the snare ring proximate the central opening, wherein the proximal end of the shrink tube is distal to the distal end of the drive strand. 2. The extraction device of claim 1, wherein the proximal end of the ring member includes a first proximal arm and a second proximal arm, and wherein a portion of the first proximal arm and the first proximal arm Parts of the two proximal arms are fastened through the shrink tube. 3. The extraction device of claim 2, wherein the first proximal arm and the second proximal arm contact each other within the shrink tube, and wherein the shrink tube includes a portion of the mesh. 4. The extraction device of claim 1, wherein at least one of the second portions of the plurality of strands terminates in a surface of the snare ring. 5. The extraction device of claim 1, wherein the layer of material comprises a first section and a second section on an opposite side of the first section, wherein a second section of the plurality of strands A portion terminates in the first segment, and wherein the second segment does not have any contact with the second portion of the plurality of strands. 6. The extraction device of claim 1, wherein the second portion of the plurality of strands is in a first section of the material layer, and wherein the second portion of the plurality of strands A portion is separated from a second section of the material layer on the opposite side of the snare ring from the first section. 7. The extraction device of claim 1, wherein the second portion of the plurality of strands is at least partially embedded in the material layer. 8. The picking device of claim 1, wherein the layer of material is green. 9. The extraction device of claim 1, wherein the layer of material covers the ring member. 10. An extraction device, comprising: A snare ring, which includes: a ring member having a first proximal arm and a second proximal arm, through the central opening of the snare ring, and a layer of material covering at least a portion of the ring member, the ring member defining the central opening; a mesh extending across the central opening of the snare ring, wherein the mesh comprises: multiple strands, and a plurality of holes between the first portions of the plurality of strands, wherein a second portion of the plurality of strands is joined to the material layer, wherein the second portion of the plurality of strands includes one or more terminations, and wherein the one or more terminations are direct and stable grounded to the material layer; A sheath, which includes: lumen, proximal end, the distal end, and a distal opening, wherein the lumen extends between the proximal end and the distal end, and wherein the lumen communicates with the distal opening; a drive strand extending through the lumen of the sheath to the snare ring, wherein movement of the drive strand within the lumen of the sheath is configured to cause the snare the snare ring and the mesh move relative to the sheath, and the second portion wherein the plurality of strands are attached to the material layer moves within the snare ring and the mesh remain firmly bonded to the layer of material during entry into and movement out of the distal opening of the sheath; and A shrink tube configured to secure the first proximal arm to the second proximal arm, wherein the first proximal arm and the second proximal arm contact each other within the shrink tube, and wherein the The shrink tube includes portions of the mesh. 11. The extraction device of claim 10, wherein a portion of the first proximal arm and a portion of the second proximal arm are enclosed by the shrink tube. 12. The extraction device of claim 10, wherein the snare ring includes a first section and a second section on the opposite side of the snare ring from the first section, and wherein the second portion of the plurality of strands is joined to the material layer only at the first section. 13. The extraction device of claim 10, wherein the layer of material is polymeric. 14. The extraction device of claim 10, wherein the second portion of the plurality of strands is at least partially embedded in the layer of material. 15. The extraction device of claim 10, wherein the ring member is made of metal. 16. An extraction device, comprising: A snare, which includes: a support member having a plurality of curves and including a first proximal arm and a second proximal arm, a central opening surrounded by the support member, A layer of material on the support member, wherein the layer of material includes a first section on a first side of the support member and a second section on a second side of the support member opposite the first side section; a mesh extending across the central opening of the snare, wherein the mesh comprises: multiple strands, a plurality of holes bounded by a first portion of the plurality of strands, wherein a second portion of the plurality of strands is attached to the first section of the material layer on the support member, but the second section not attached to the layer of material on the support member; A sheath, which includes: lumen, proximal end, the distal end, and a distal opening, wherein the lumen extends between the proximal end and the distal end, wherein the lumen communicates with the distal opening, and wherein the snare and the mesh can be extends beyond the distal opening and is retractable into the distal opening; a drive strand extending through the lumen of the sheath to a portion of the snare proximate the central opening, wherein a kinematic configuration of the drive strand within the lumen of the sheath to make: moving at least a portion of the snare and at least a portion of the mesh distally out of the distal opening of the sheath, and moving at least a portion of the snare and at least a portion of the mesh proximally into the distal opening of the sheath, wherein the second portion of the plurality of strands is in the The snare and the mesh remain firmly bonded to the layer of material as they move through the distal opening of the sheath; and a fastener configured to secure the first proximal arm to the second proximal arm, wherein the first proximal arm and the second proximal arm are held together by the fastener, and wherein the fastener is at the proximal end of the mesh. 17. The extraction device of claim 16, wherein a portion of the first proximal arm and a portion of the second proximal arm are encased by the fastener. 18. The extraction device of claim 16, wherein the second portion of the plurality of strands is at least partially embedded in the layer of material on the support member. 19. The extraction device of claim 16, wherein one or more of the second portions of the plurality of strands include a disconnected end that is fixed and immovable grounded to the layer of material on the support member. 20. The extraction device of claim 16, wherein the support member comprises one of braided steel, stainless steel, and nitinol.

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